215666041 has 2 divisors, whose sum is σ = 215666042. Its totient is φ = 215666040.

The previous prime is 215666021. The next prime is 215666053. The reversal of 215666041 is 140666512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196560400 + 19105641 = 14020^2 + 4371^2 .

It is a cyclic number.

It is not a de Polignac number, because 215666041 - 2⁷ = 215665913 is a prime.

It is a super-2 number, since 2×215666041² = 93023682481227362, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 215665994 and 215666012.

It is not a weakly prime, because it can be changed into another prime (215666021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107833020 + 107833021.

It is an arithmetic number, because the mean of its divisors is an integer number (107833021).

Almost surely, 2^215666041 is an apocalyptic number.

It is an amenable number.

215666041 is a deficient number, since it is larger than the sum of its proper divisors (1).

215666041 is an equidigital number, since it uses as much as digits as its factorization.

215666041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 215666041 is about 14685.5725458696. The cubic root of 215666041 is about 599.6906192037.

The spelling of 215666041 in words is "two hundred fifteen million, six hundred sixty-six thousand, forty-one".